ISSN:
1434-1948
Keywords:
Palladium(II) complexes
;
Oligonitriles
;
N ligands
;
S ligands
;
N-Acylimine
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Two mononuclear six-membered chelate PdCl2 complexes 2a, b of the two different types of tetrameric oligonitriles 1a, b have been synthesized. Both contain square-planar palladium(II) with a cis arrangement of the chloride atoms. In complex 2a of the ω-amino-substituted N-methoxycarbonyl oligonitrile 1a the metal center is coordinated by the nitrogen atoms N1 and N3. Within the chelate ring alternating bond lengths for the C-N bonds are observed, whereas the non-complexed, more flattened part of the oligonitrile chain shows almost equal C-N bond lengths, indicating strong donor-acceptor interactions involving the terminal amino group and the N3-Pd moiety of the molecule. The complex 2b is derived from the thiobenzoyl ligand 1b bearing a terminal (R)-fenchylidene group. In 2b the sulfur atom S1 and the nitrogen atom N2 are involved in complexation. In contrast to 2a, strong bond-length alternation is observed in 2b for the complexed and the non-complexed part of the ligand. From the NMR spectra of both complexes no indication for a migration of the PdCl2 unit along the chain could be derived.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
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